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Old 26th November 2012, 01:39 PM   #1
Stee is offline Stee  Italy
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Default HYBRID TUBE CFP

this circuit can be nice
zero feedback
self DC control
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Old 26th November 2012, 01:59 PM   #2
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48 volt supply for a tube? What tube would that be?
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Old 26th November 2012, 05:49 PM   #3
Bigun is offline Bigun  Canada
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I'm sure there are tubes that will function at 48V but I'm more concerned about the gain of the tube VAS - I'm not so sure it has any ?
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Old 26th November 2012, 05:59 PM   #4
DF96 is offline DF96  England
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Who owns the copyright for the right-hand part of the circuit? The OP has a habit of posting circuits without proper attribution, usually in the Solid State area. Newbies should take his comments with a pinch of salt.
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Old 26th November 2012, 06:09 PM   #5
bigwill is offline bigwill  United Kingdom
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As drawn it looks like that valve stage will have a gain of unity even given higher voltage rails - not much of a VAS
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Old 27th November 2012, 08:58 AM   #6
Stee is offline Stee  Italy
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Default I would use a 6H30Pi

do not look at the values ​​of resistors: Rolleyes:
EDIT YOUR VERSION
the CFP is derived from

https://picasaweb.google.com/1031761...lyAugustIssue#

The tubes work very well in low-voltage
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Old 27th November 2012, 09:06 AM   #7
bigwill is offline bigwill  United Kingdom
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With the values shown and the split rails the gain will now be a whopping 0, as the first valve will be turned on hard.
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Old 27th November 2012, 10:19 AM   #8
DF96 is offline DF96  England
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Let's ask the OP:
1. Have you built it? If so, what did it sound like?
2. Have you simulated it? If so, how well did it work?
3. Have you calculated anything (e.g. gain)? If so, what?

If none of the above, what is your purpose in posting? It clearly isn't education, as you are not explaining anything. It can't be bragging, as the circuits are generally poorly designed or just ripped off other people.
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Old 27th November 2012, 10:29 AM   #9
pergo is offline pergo  Italy
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he always posts spam circuits
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Old 27th November 2012, 10:32 AM   #10
bigwill is offline bigwill  United Kingdom
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Circuit spam - only on diyAudio!
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